油池火灾下空心板通道桥温度场及结构损伤分析

Analysis of Temperature Field and Structural Damage of Hollow Slab Channel Bridge Under Oil Pool Fire

摘要

为研究油池火灾下空心板通道桥梁底温度场分布及结构损伤特征，利用FDS分析不同油池火灾场景下空心板通道桥梁底温度场分布，利用ABAQUS对所有火灾场景中最不利的空心板梁进行热传导分析，获取梁体内部温度场，最后利用基于强度折减的虚拟层截面等效原理，计算其火灾损伤程度。结果表明：空心板通道桥跨径越小、桥下净高越大、油池面积越大，梁底温度越高；梁底宽度对梁底温度场的影响不显著；在风速较小时，梁底最高温度会升高，但风速过大时，火焰被吹出通道桥，导致梁底温度变低。同时根据钢绞线、钢筋和混凝土虚拟层的损伤数据，分阶段建立了油池火灾下空心板梁跨中截面抗弯承载力保有率的预测公式。研究结果可为通道桥的灾后评定、加固和修复方案制定、防火措施研究等方面提供参考。

Abstract

To study the temperature field distribution and structural damage characteristics of hollow slab channel bridges under oil pool fire scenarios, FDS was used to analyze the temperature field distribution at the bottom of hollow slab channel bridge under different oil pool fire scenarios. ABAQUS was used to conduct heat conduction analysis on the most unfavorable hollow slab girder in all fire scenarios, and the internal temperature field of the girder was obtained. Finally, based on the equivalence principle of cross sectional virtual layer due to the reduction of the strength, the fire damage degree was calculated. The results showed that the smaller the span of hollow slab channel bridge, the larger the bridge vertical clearance and the larger the area of the oil pool, the higher the temperature at the girder bottom. The influence of girder bottom width on temperature field of girder bottom is not significant. When the wind speed is small, the maximum temperature at the girder bottom will increase, but when the wind speed is too large, the flame will be blown out of the channel bridge, resulting in lower temperature at the girder bottom. Meanwhile, according to the damage data of steel strands, steel bars and concrete virtual layers, the prediction formula of flexural capacity retention rate of hollow slab girder under oil pool fire is established in stages. The research results can provide reference for the post-disaster assessment, formulation of plans to reinforcement and repair, and fire prevention measures research of the channel bridges.

关键词

油池火灾 / 空心板 / 通道桥 / 温度场 / 火灾损伤

Key words

oil pool fire / hollow slab / channel bridge / temperature field / fire damage

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基金资助

国家自然科学基金项目(52068026)

国家自然科学基金项目(52368073)

赣鄱俊才支持计划(20243BCE51050)

江西省自然科学基金项目(20232BAB204070)

江西省自然科学基金项目(20232BAB204071)